After a quiz or test is taken in Brightspace, you may wish to review the questions that were challenging to your students.  While you may wish to continue asking your students what questions challenged them, you can also gauge idividual Question Statistics in Manage Quizzes.

This information may cause you to evaluate the question language or modify how a concept is taught.

Manage Quizzes -> View Statistics -> Question Stats

quizz Context menu screenshot
Question Stats screenshot]